# Rockwell B-1 Lancer
The Rockwell B-1 Lancer is a supersonic, variable-geometry-wing heavy bomber of the [United States Air Force](https://www.edgepedia.org/united-states-air-force), developed by [Rockwell International](https://www.edgepedia.org/rockwell-international) (now part of [Boeing Defense, Space & Security](https://www.edgepedia.org/boeing-defense-space-and-security)) as a low-altitude Cold War penetration bomber and flown since 1986 in a conventional-only strike role.[1](https://www.everycrsreport.com/reports/R43049.html) One hundred B-1B models were built after the earlier B-1A prototype program was canceled in 1977 and revived in 1981.[1](https://www.everycrsreport.com/reports/R43049.html) • [2](https://www.sacmuseum.org/visit/exhibit/b-1a-lancer/) The Air Force ended the B-1's nuclear mission in 1992, and the aircraft has since served as the service's largest conventional payload carrier, most prominently in Afghanistan and the Middle East.[1](https://www.everycrsreport.com/reports/R43049.html) • [3](https://www.gao.gov/assets/gao-23-106217.pdf?pubDate=20260616)
| Key fact | Detail |
|---|---|
| Role and origin | Low-altitude Cold War supersonic bomber developed by Rockwell International; became operational in 1986[1](https://www.everycrsreport.com/reports/R43049.html) |
| Speed and crew | More than 900 mph (Mach 1.2) at sea level; crew of four (aircraft commander, copilot, offensive systems officer, defensive systems officer)[4](https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/198101/boeing-b-1b-lancer/) |
| Payload | 75,000 pounds (34,019 kilograms), the largest conventional payload of guided and unguided weapons in the Air Force inventory[5](https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104500/b-1b-lancer/About-Us/b-1b-lancer/) • [3](https://www.gao.gov/assets/gao-23-106217.pdf?pubDate=20260616) |
| Armament examples | 84 Mk-82 or 24 Mk-84 bombs; up to 24 GBU-31 Joint Direct Attack Munitions; up to 24 AGM-158A Joint Air-to-Surface Standoff Missiles[5](https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104500/b-1b-lancer/About-Us/b-1b-lancer/) |
| Records | Holds almost 50 world records for speed, payload, range, and time of climb in its class[5](https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104500/b-1b-lancer/About-Us/b-1b-lancer/) |
| Fleet size | 100 built; fewer than 60 remain in service at Dyess AFB, Texas, and Ellsworth AFB, South Dakota[6](https://apnews.com/article/2146e52e94ae5f928407a85030e8c60d) |
| Nuclear status | Nuclear mission ended in 1992; the aircraft does not carry nuclear weapons[1](https://www.everycrsreport.com/reports/R43049.html) • [6](https://apnews.com/article/2146e52e94ae5f928407a85030e8c60d) |
| Retirement plan | B-1 retirement and divestment are tied to B-21 Raider production deliveries in accordance with National Defense Authorization Acts[7](https://comptroller.defense.gov/Portals/45/Documents/defbudget/FY2025/FY2025-28_Force_Structure_Changes_Exhibit.pdf) |
## Design
The B-1 is a "swing wing" strategic bomber of blended wing-body design intended for high-speed, low-altitude penetration missions.[2](https://www.sacmuseum.org/visit/exhibit/b-1a-lancer/) Its blended wing/body configuration, variable-geometry wings, and turbofan afterburning engines combine to provide long range, maneuverability, and high speed while enhancing survivability; aft wing sweep settings, the main combat configuration, are used during high subsonic and supersonic flight.[5](https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104500/b-1b-lancer/About-Us/b-1b-lancer/) The National Museum of the United States Air Force credits the same combination with more than 900 mph (Mach 1.2) at sea level.[4](https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/198101/boeing-b-1b-lancer/) Features such as a small radar signature, wings with adjustable geometry, its electronics suite, and engines fitted with afterburners gave it better protection than the B-52 against hostile surface-to-air missiles and interceptors.[1](https://www.everycrsreport.com/reports/R43049.html)
The B-1A prototypes carried features that did not carry into the B-1B, including variable-geometry engine intakes that moved to give the best performance at a range of speeds, and an escape capsule that would eject the entire crew together; the B-1B uses standard ejection seats instead.[8](https://wingsmuseum.org/exhibits/rockwell-b-1a-lancer/) • [2](https://www.sacmuseum.org/visit/exhibit/b-1a-lancer/)
## From B-1A to B-1B
The B-1A was initially developed in the 1970s as a replacement for the B-52, with an original 1969 requirement for 250 bombers.[9](https://sgp.fas.org/crs/weapons/RL34406.pdf) • [1](https://www.everycrsreport.com/reports/R43049.html) President Jimmy Carter canceled the program in 1977; political support for the B-1A waned because of reduced military spending after the [Vietnam War](https://www.edgepedia.org/vietnam-war) and problems within the program itself.[1](https://www.everycrsreport.com/reports/R43049.html) President Reagan revived the program in 1981, and the 100 B-1Bs eventually built resulted from an Air Force proposal that split the originally envisioned 250 B-1As between 100 B-1Bs and 132 B-2 stealth bombers.[1](https://www.everycrsreport.com/reports/R43049.html) A 1984 Department of Defense annual report described the B-1B as a strategic penetrator for the 1980s, to carry cruise missiles as part of its weapons mix once the advanced technology bomber (the future B-2) deployed in the 1990s.[10](https://history.defense.gov/Portals/70/Documents/annual_reports/1984_DoD_AR.pdf?ver=2014-06-24-151113-310)
Early assessments flagged uncertainty. A 1989 General Accounting Office report, *Strategic Bombers: B-1B Cost and Performance Remain Uncertain*, examined the status of major B-1B systems, the test program, current cost estimates, and cost estimates for identified enhancements.[11](https://www.gao.gov/products/nsiad-89-55) A 1995 GAO review of the Air Force's Operational Readiness Assessment addressed the effectiveness of the B-1B bomber wing and the additional spares, maintenance manpower, and logistics support needed to reach the planned 75-percent mission capable rate.[12](https://www.gao.gov/products/nsiad-95-151)
## Conventional conversion
After the Cold War concluded, the Air Force removed the B-1 from its nuclear role in 1992 and started converting it to carry conventional weapons exclusively.[1](https://www.everycrsreport.com/reports/R43049.html) The Conventional Mission Upgrade Program (CMUP) transformed the B-1B into a conventional-only bomber capable of employing GPS-guided Joint Direct Attack Munitions (JDAM) and long-range standoff Joint Air-to-Surface Standoff Missiles (JASSM).[1](https://www.everycrsreport.com/reports/R43049.html) The B-1B was reassigned solely to conventional operations, and in 1998 it saw action for the first time in combat as part of Operation Desert Fox.[13](https://www.af.mil/News/Article-Display/Article/128283/20-years-of-lethality-ellsworth-celebrates-b-1s-history/)
## Combat service
**Operation Allied Force, 1999.** On April 1, 1999, five B-1 bombers from the 28th Bomb Wing took off from Ellsworth Air Force Base, South Dakota, to join NATO forces striking military targets in Kosovo.[14](https://www.acc.af.mil/News/Features/Display/Article/204064/coming-of-age-b-1-proves-itself-during-operation-allied-force/) Aircrews flew from [RAF Fairford](https://www.edgepedia.org/raf-fairford) in the United Kingdom, and B-1s were targeted by surface-to-air missiles during nearly every sortie one pilot flew.[14](https://www.acc.af.mil/News/Features/Display/Article/204064/coming-of-age-b-1-proves-itself-during-operation-allied-force/) By the end of the conflict in June 1999, B-1s from Ellsworth flew over 100 planned combat missions and dropped more than 1,260 tons of Mk-82 general purpose bombs, delivering more than 20 percent of the total ordnance while flying less than 2 percent of the combat sorties during the operation.[14](https://www.acc.af.mil/News/Features/Display/Article/204064/coming-of-age-b-1-proves-itself-during-operation-allied-force/)
**Afghanistan and the Middle East.** Operation Enduring Freedom began on October 7, 2001, with coalition aircraft including B-1 and B-52 bombers performing night strikes against 31 targets.[15](https://www.afhistory.af.mil/FAQs/Fact-Sheets/Article/458975/2001-operation-enduring-freedom/) By the end of October 2001, nearly all fixed targets in Afghanistan had been destroyed, and the B-1B's role changed to ground support; B-1 aircrews from Ellsworth and Dyess have conducted continuous combat operations in Southwest Asia since 2001.[16](https://www.ellsworth.af.mil/News/Features/Display/Article/217603/bones-over-southwest-asia-part-iii/) The success of the initial deployment from [Diego Garcia](https://www.edgepedia.org/diego-garcia) reshaped B-1 close air support employment in Afghanistan.[17](https://www.afcent.af.mil/News/Commentaries/Display/Article/223209/legacy-of-leadership-decade-of-dominance/) In February 2024, a pair of B-1 bombers took off from [Dyess Air Force Base](https://www.edgepedia.org/dyess-air-force-base) and flew more than 30 hours on a roundtrip mission in which they struck 85 Islamic Revolutionary Guards Corps Quds Force targets in Iraq and Syria, part of a U.S. retaliation involving more than 125 precision munitions delivered by numerous aircraft including long-range B-1 bombers flown from the United States.[18](https://apnews.com/article/229a735edbb7759ba9ade543013917df)
## Sustainment and fleet drawdown
Sustaining the fleet has been a recurring congressional concern. The B-1 Strategic Action and Investment Plan, prepared for [Air Combat Command](https://www.edgepedia.org/air-combat-command), concluded that appropriations of $250 million per year out to 2022 were the minimum recommended funding level for B-1 sustainment and modernization, with $400 million per year the highest considered funding profile.[1](https://www.everycrsreport.com/reports/R43049.html) A Government Accountability Office review of weapon system sustainment found that aircraft mission capable rates, including the B-1B's, generally did not meet goals and that sustainment costs varied widely by aircraft.[19](https://www.gao.gov/assets/gao-21-101sp.pdf)
The fleet has been shrinking as the B-21 Raider approaches service. [Air Force Global Strike Command](https://www.edgepedia.org/air-force-global-strike-command) wrapped up the divestiture of 17 B-1B aircraft as part of the move toward the B-21.[20](https://www.af.mil/News/Article/2788395/afgsc-wraps-up-divestiture-of-17-b-1b-aircraft-moves-toward-b-21/) The Defense Department's force structure plans tie B-1 retirement and divestment to B-21 production deliveries in accordance with National Defense Authorization Acts.[7](https://comptroller.defense.gov/Portals/45/Documents/defbudget/FY2025/FY2025-28_Force_Structure_Changes_Exhibit.pdf) In early 2025 the Air Force temporarily relocated the entire B-1B fleet from Ellsworth Air Force Base, South Dakota, during runway modernization ahead of the B-21's arrival, sending aircraft to Grand Forks Air Force Base in [North Dakota](https://www.edgepedia.org/north-dakota) and to [Andersen Air Force Base](https://www.edgepedia.org/andersen-air-force-base) in Guam as part of a Bomber Task Force deployment.[21](https://as.com/actualidad/politica/estados-unidos-esta-movilizando-toda-su-flota-de-bombarderos-estrategicos-b-1-en-un-traslado-no-visto-en-30-anos-n/)
**Safety and regeneration.** In January 2024, a B-1 Lancer from Ellsworth crashed while trying to land during a training mission in poor visibility with freezing temperatures and low clouds; all four crew members ejected safely.[6](https://apnews.com/article/2146e52e94ae5f928407a85030e8c60d)
## Forty years of service
Originally intended as a temporary solution, the B-1B marked 40 years of service in 2025, with the Air Force describing the aircraft as still a critical asset to the bomber force and noting ongoing modernization programs aimed at enhancing its capabilities for future conflicts.[22](https://www.afmc.af.mil/News/Article-Display/Article/4243079/b-1-bomber-celebrates-40-years/) In the early 1990s, the Conventional Munitions Upgrade Program started converting the B-1 from a nuclear-capable bomber into an aircraft for conventional strikes.[23](https://www.aerotechnews.com/wp-content/PDFs/080125AERODIG.pdf)
## References
1. [U.S. Air Force Bomber Sustainment and Modernization: Background and Issues for Congress, CRS Report R43049, EveryCRSReport.com](https://www.everycrsreport.com/reports/R43049.html)
2. [B-1A "Lancer," SAC Aerospace Museum](https://www.sacmuseum.org/visit/exhibit/b-1a-lancer/)
3. [GAO-23-106217, Weapon Systems Sustainment: Aircraft Mission Capable Goals Were Generally Not Met and Sustainment Costs Varied by Aircraft](https://www.gao.gov/assets/gao-23-106217.pdf?pubDate=20260616)
4. [Boeing B-1B Lancer, National Museum of the United States Air Force](https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/198101/boeing-b-1b-lancer/)
5. [B-1B Lancer Fact Sheet, U.S. Air Force](https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104500/b-1b-lancer/About-Us/b-1b-lancer/)
6. [A B-1 bomber crashes while trying to land at a South Dakota Air Force Base; the crew safely ejects, AP News](https://apnews.com/article/2146e52e94ae5f928407a85030e8c60d)
7. [FY2025-28 Force Structure Changes Exhibit, Office of the Under Secretary of Defense (Comptroller)](https://comptroller.defense.gov/Portals/45/Documents/defbudget/FY2025/FY2025-28_Force_Structure_Changes_Exhibit.pdf)
8. [Rockwell B-1A Lancer, Wings Over the Rockies Air & Space Museum](https://wingsmuseum.org/exhibits/rockwell-b-1a-lancer/)
9. [Air Force Next-Generation Bomber: Background and Issues for Congress, CRS Report RL34406](https://sgp.fas.org/crs/weapons/RL34406.pdf)
10. [1984 Department of Defense Annual Report, Office of the Secretary of Defense Historical Office](https://history.defense.gov/Portals/70/Documents/annual_reports/1984_DoD_AR.pdf?ver=2014-06-24-151113-310)
11. [Strategic Bombers: B-1B Cost and Performance Remain Uncertain, GAO NSIAD-89-55](https://www.gao.gov/products/nsiad-89-55)
12. [B-1B Bomber: Evaluation of Air Force Report on B-1B Operational Readiness Assessment, GAO NSIAD-95-151](https://www.gao.gov/products/nsiad-95-151)
13. [20 years of lethality: Ellsworth celebrates B-1's history, U.S. Air Force](https://www.af.mil/News/Article-Display/Article/128283/20-years-of-lethality-ellsworth-celebrates-b-1s-history/)
14. [Coming of age: B-1 proves itself during Operation Allied Force, Air Combat Command](https://www.acc.af.mil/News/Features/Display/Article/204064/coming-of-age-b-1-proves-itself-during-operation-allied-force/)
15. [2001 - Operation Enduring Freedom, Air Force Historical Support Division](https://www.afhistory.af.mil/FAQs/Fact-Sheets/Article/458975/2001-operation-enduring-freedom/)
16. [Bones over Southwest Asia Part III, Ellsworth Air Force Base](https://www.ellsworth.af.mil/News/Features/Display/Article/217603/bones-over-southwest-asia-part-iii/)
17. [Legacy of Leadership -- Decade of Dominance, U.S. Air Forces Central](https://www.afcent.af.mil/News/Commentaries/Display/Article/223209/legacy-of-leadership-decade-of-dominance/)
18. [US hits hard at militias in Iraq and Syria, retaliating for fatal drone attack, AP News](https://apnews.com/article/229a735edbb7759ba9ade543013917df)
19. [GAO-21-101SP, Weapon System Sustainment: Aircraft Mission Capable Rates Generally Did Not Meet Goals](https://www.gao.gov/assets/gao-21-101sp.pdf)
20. [AFGSC wraps up divestiture of 17 B-1B aircraft, moves toward B-21, U.S. Air Force](https://www.af.mil/News/Article/2788395/afgsc-wraps-up-divestiture-of-17-b-1b-aircraft-moves-toward-b-21/)
21. [Estados Unidos está movilizando toda su flota de bombarderos estratégicos B-1 en un traslado no visto en 30 años, AS](https://as.com/actualidad/politica/estados-unidos-esta-movilizando-toda-su-flota-de-bombarderos-estrategicos-b-1-en-un-traslado-no-visto-en-30-anos-n/)
22. [B-1 Bomber Celebrates 40 Years, Air Force Materiel Command](https://www.afmc.af.mil/News/Article-Display/Article/4243079/b-1-bomber-celebrates-40-years/)
23. [B-1 Lancer celebrates 40 years of service, Aerotech News](https://www.aerotechnews.com/wp-content/PDFs/080125AERODIG.pdf)
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*Topic: Encyclopedia › Technology and the built world › Transport and spaceflight › Aviation › Military aviation › Military aircraft by type and era › Bomber and strike aircraft › United States bomber and strike aircraft*
*Initially written Sep 17, 2026 · Reviewed: Sep 17, 2026; Sep 30, 2026; Oct 15, 2026 · Edited: Oct 15, 2026 · Last review: Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license